The University of Southampton is part of the IEEE Open Access Unlimited agreement (beginning 30 Nov 2017) meaning you can publish open access for free. All researchers with a University of Southampton affiliation can make their work open access immediately upon publication in IEEE journals at no additional cost.
On acceptance you will be asked if you wish to make your work open access. When you confirm that you do, University of Southampton library staff will verify your affiliation. Then your work will be made available on an open access basis, under the terms of the Creative Commons Attribution License, CC BY (which will meet the requirements of all major research funders). Please contact email@example.com if you have any questions. We will be happy to help.